Missing Songs & Albums

Newbie here. I’ve read and searched most posts but I still can’t resolve my problem. My music folders are structured Artist/Album. I use Kodi on Amazon Fire TV (Android) but there are many missing albums and songs. After reading here I took 2 of the artists I’m having trouble with and I used MusicBrainz Picard to tag them but this didn’t help. Album is listed but no tracks or 3 tracks appear but the rest do not. One album appears perfectly. I have also deleted the source and started over but that didn’t help. Not sure what to do next so any help will be greatly appreciated.

As a side note, I loaded Kodi on my PC and all the data appears fine so the issue may be how android is handling it.

Thanks